Transformer.



A. H. PIKLER.

TRANSFORMER.

APPLICATION FILED MAB..17, 1910.

1,133,316. Patented Mar.80,1915.

Fig. L

Fig 3- W1 h'lesse Inventor- W Armin Henry Pflrer, M W AH ey UNITED sTATEs PATENT OFFICE.

ABMIN HENRY IPIKLER, OF MONTCLAIR, NEW

JERSEY, .ASSIGNOR TO CROCKER- WHEELER COMPANY, OF AMPERE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TRANSFORMER Specification of Letters Patent.

Patented Mar. 30, 1915.

Application filed March 17, 1910. Serial No. 549,908.

To all whom it may concern:

Be it known that I, ARMINHENRYPIK- LER, a subject of the King of Hungary, and a resident of Montclair, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Transformers, of which the following is a specification.

The object of this invention 1s to provide an etlicient transformer or induction coil of simple construction in which the magnetic circuit is such that magnetlc leakage and consequently the magnetiz ng current and also eddy currents are m1n1m1zed at the joints and in which the several parts are suitably proportioned and disposed to produce the of energy and with a minimum amount of material for both core and coils. I

In the accompanying sheet of drawings illustrating my invention which forms a part of this applicationFigure is a plan of a portion of a strip sheet of 1IOI1 from which are punched at each stroke of the punching press one lamination for the core and one magnetic circuit. Fig. 2 is a perspective of the core. Fig. 3 is a perspective of the core and windings. Fig. 4 is a. per spective of the windings and the core together with the partially built up yoke. Fig. 5 is a vertical section through the transformer on the line VV of Fig. 4. Fig. 6 is a perspective of one of the supporting clamps for the yoke. Fig. 7 is a perspective of one of the center clamps for the yoke.

The transformer has a magnetic circuit consisting of a core formed of a bundle of sheet-iron laminations A and ayoke formed of a bundle of sheet-iron laminations B surrounding the core. In the process of manufacturing the sheet-iron supplied by.

the steel mill is sheared wider in size than the of the yoke.

into strips slightly exterior dimensions From this strip by the application of a punch'and die a. core lamination A and a yoke lamination B are punched simultaneously. For the purpose of identification one of the interior corners a is broken by a. short diagonal forming a distinctive corner so that, in assembling, the yoke and core laminations may be kept desired transforming or ina (luctive action with the least expenditure 'netic joints lamination for the yoke of the the same side up and lie in the same direction so that the edges at the ends of the core laminations will be brought into contact with the ed es of the yoke laminations which were cut hy the punch and die. This is desirable since the shear edges of a punch and die expected to be parallel may be slightly divergent and beveled and the edges will lie together best if the parts face the same as before they were punched, and edges formed by the same sides of the punch and die are brought together. 'The laminations are electrically insulated from one another by suitably coating their surfaces. I

By reason of the provisions made as described above and by reason ofthe butt joints made between the core and yoke laminations, both the mechanical and the mag between the core laminations and the yoke laminations are very intimate and the lines of force continue parallel to the laminations in passing from the core into the yoke, and eddy currents in the laminations are avoided. By reason of the intimate -mechanical joints the magnetic leakage and consequently the exciting current are minimized. The lines of force from the core divide at either end on passing into the yoke and half are conducted by each side. The yoke laminations are made Wider than one-half the width of the core thereby creating a return path of lower magnetic resistance, resulting in a lower core loss and a lower exciting current. By this arrangement the bulk of the sheet'iron material is working at a low magnetic density and the mean length of the turns of the windings is maintained small since they are located around the core, the dimensions of which are small. Thus a low core loss and low exciting current are obtained by small expenditure of copper.

the same shear edges of The core laminations are held together by U-shaped clamps C C. Strips of insulation 2' 2' are laid between the clamps and the laminations.

The windings D are formed with passageways d 0! parallel to the axis of the windings on the sides which lie outside the yoke plates where their ends will not be obstructed for the purposes of cooling, but the wind" rugs are not so separated on the sides adoining the sides 0 the yoke plates in order to keep down the size of the winding space and consequently the length of the magnetic circuitQ -The transformer is set up so as to bring these passageways vertical so that whatever fluid may be employed for cooling, air: or oil, for example, will on becoming heated, tend to rise and a natural circulation will thereby be created.

After the. core and windings are assembled, the yoke isbuilt up in place over the ends of the core in single sheets or in small groups. The assembled yoke laminations are also bound by U-shaped clamps e and f. The former clamp the middle of the upper and lower sides of the yoke and the latter clamp the vertical sides of the yoke. It is also possible to build up the yoke plates complete and bind them together by U- shaped clamps and press the thus built up yoke frame as one unit over the two ends of the core assembled with the windings, the latter being placed in a suitable cradle to be supported. 4

\Vhat I claim as new, and desire to secure by Letters Patent of the United States 1. In a transformer, a magnetic circuit consisting of a bundle of sheet metal yoke plates, and av bundle of sheet metal-core plates punched from the yoke plates the ends of the core-plates being approximately parallel with each other and forming butt joints with the yoke plates, the core plates and the yoke plates being assembled so that each core and yoke plate is the same side up and lies in the same direction that it occupied before the punching, substantially as described.

2. In a transformer, a magnetic circuit consisting of a bundle of sheet metal yoke plates and a bundle of sheet metal core plates the ends of the core-plates being approximately parallel with each other punched from the yoke plates and forming butt joints with the yoke plates, one of the corners of each of the core plates and yoke plates being distinctive, the core plates and the yoke plates being assembled so that each core and yoke plate is the same side up and lies in the same direction that it occupied before the punching, substantially as de scribed.

3. In a transformer, a magnetic circuit consisting of a bundle of sheet metal yoke plates, and a bundle of sheet metal core plates punched from the yoke plates and forming butt joints with the yoke plates, the core plates and yoke plates being assembled so that each core and yoke plate is the same side up and lies in the same direction that it occupied before the punching, the butt joints in the several plates on each side of the transverse axis of the core plate being symmetrical in respect thereto substantially as described.

Signed at East Orange, N. J this 16th day of March, 1910.

' ARMIN HENRY PIKLER.

Witnesses:

J. ELIAS Ferns, Gnomes K. KAISER. 

